High-speed-spindle device.



F. D. VAN NORMAN.

HIGH SPEED SPINDLE DEVICE.

APPLICATION FILED APR.9. 1912.

1,155,176. Patented Sept. 28, 1915.

f%/f/ wa/ ATTORNEY.

, To all whom it may concern:

' orrio.

FREDERICK :o. VAN.1\TORMAN, @esmmemm, ijiaassnc'nosnrrs, assienon, BY

MESNE ASSIGNMENTS, 'IO van NORMAN MACHINE root. COMPANY, or srninc- FIELD, nassnonusnrrs, a conroner on F massacnosnrrs,

men-srnnn srmnnn nnvlen.

Patented Sept. as, 1915.

Application filed April 9, 1912." Serial No. eeasav.

Be it known that I, F EDERICK NORMAN, a citizen of the United States of America, and resident of Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in High-Speed-Spindle Devices, of which thefollowing is a full, clear,

and exact description.

This invention relates to improvements in high speed spindle devices of the character such, for instance, as described in anapplication for Letters Patent of the United States filed by me January 27, 1909, Serial No. 474,611.

In devices of the kind to which this'invention relates, a spindle may be employed for the carrying of a grinding wheel; and for the efficiency of the grinding or other machine in which the spindle is comprised, the highest attainable speed is desirable. It has, however, been found practically impossible to run the spindle at a speed equal to mechanical possibilities owing to the fact that the spindle becomes heated to such a degree as to cause a deteroriation, or de-' rangement of the mechanism.

. The employment of the best possible kind of bearings and the lubricating means-in the high speed spindle deviceare necessary, and in addition thereto, according to the aim of the present invention, it is ,highly desirable to provide means fora direct and positive cooling of the spindle;

To this end the invention consists inthe high speed spindle device hereinafter de-' scribed 1n conjuction with the accompanying drawings and set forth in the claim.

lln the drawingsF-Figure l 'is a longitudinal sectional view through a bearing head which has mounted therein a spindle constructed in accordance with the invention as the same has been carried out by me.

' Fig. 2 is a longitudinal sectional view 3 to 7 are sectional views showing modifica tion in the construction of the spindle, all

through the spindle, on a larger scale. Figs.

n. via

dle l) is extended-centrally and longitudinally through the head and, has journal peariggs and supports in the bearing memers The spindle is provided with duplicate pulleys E on portions thereof which are projected outside of and endwise beyond the bearing head, and a grinding wheel F is shown as being carried on the end of the "spindle.

The spindle is made hollow by having a bore a therein which in Figs. 1 and 2 is shown as extending from one end of the spindle almost entirely therethrough but having a Wall closing its end a at a location remote from its open end a One or morelholes or passages are drilled- .through the spindle from its exterior to the bore and angularly to the length of the latter. In Figs. 1 and 2 these passages are produced by radially drilled holes.

When the spindle is rotated with extreme rapldity, say at 20,000 turns per minute,'a vacuum Wlll be created at the orifices of the passages b which have their locations outwardly beyond the diameter of the loore,

causing a strong draft of air to enter at the 'end of the spindle and be carried through 'the bore for exit at the mouths of said passages b. lhis action is found in practice to entially of thespindleterminate at the end thereof, their. positions being through an end wall (i in oblique directions.

The construction shown in. Fig. 4 does not materially difi'er from that represented in Figs. land 2 excepting that the radial passages are somewhat longer and terminate farther away from the bore.

' In Eigs. 5 and 6 the spindle having the bore opening to one end is at a part suitably remote from such end made with suitably shaped enlargements f, and passages b 6 are formed which extend from the bore to side faces f f of the enlargements f whielyare: mereer less nesrly radial te the axis of the bore, so that is the rapid; ratetier: of. the spindle-the impingement of. she

side faces 7, f agains'i; the air W111 cause a. forcing of the lafister into the. bore at the -closed portion and for its exit at; its open. I

which While associated with the spindieis' not necessarily a part; thereof. In; this-view,

the portion i? may be of a, eenstmcsien similar to that shown in Figs. 5 23d 6, but compriseai in a; revoluble member which is separately formed from the spindle and having" means, such as the pulley f appurtenant to itself for its rotationwhi1e the spinel'e may have its ewn means for refisting ie whieh are independent of the pulley f formefi, as me with, or attached togthe part f.

Eelsim: in a high-velocity spindle device, com,-

bination, a, bearing, a spindle rotatable in.

sai. bearing, and having a, bore longitudi nally therein and extending through an open end. 0f the spindle and directfleommumca- :tion wish the atmosphere, s passage leacfing from the bore angularly to the length of the latter and. also in communication with the atmesphere enfi means fer retatmg the Signed by me at Springfield, Mass, in. presence of two subscribing witnesses FREDERICK D. VAN NORMAN Wimesses: c

G. R. DRISCOIL, Wms S. BELLOWS. 

